THE DALMATIAN DILEMMA
White coat colour and Deafness.
REFERENCE TABLES
by
DR. BRUCE M CATTANACH
Table 1.
Breed specific deafness attributable to s and M
alleles
|
Breed |
Bilaterally deaf |
Unilaterally deaf |
Normal |
Total |
Genotype |
|
American Dalmatians |
8.0% |
21.8% |
70.2% |
4566* |
sw sw |
|
White Bull Terrier |
1.5% |
17.5% |
81.0% |
269 |
sw sw |
|
English Setter |
2.4% |
12.7% |
84.9% |
370 |
sw
sw |
|
English Cocker Spanial |
1.8% |
7.0% |
91.2% |
388 |
sp sp |
|
Coloured Bull Terrier |
0.0% |
2.1% |
97.9% |
232 |
+ sw? |
|
Australian Cattle Dog |
2.9% |
8.5% |
88.6% |
70 |
M + |
|
Norwegian Dunkerhound |
- 75.0% |
- |
25.0% |
? |
MM |
* from Strain et al (1992), Strain (1996) and Strain and Tedford (1996)
Table 2
Incidences of deafness in Dalmatians
|
Researchers |
Bilaterally deaf |
Unilaterally deaf |
Normal |
No of dogs |
|
Strain et al, USA (1992) |
|
|
|
|
|
LA group |
12.7% |
22.5% |
64.7% |
377 |
|
AZ group |
5.9% |
23.3% |
70.8% |
305 |
|
CA group |
4.9% |
19.2% |
75.9% |
349 |
|
Strain, USA (1996) |
8.0% |
21.8% |
70.2% |
5379* |
|
Holliday et al, USA (1992) |
7.0% |
21.0% |
72.0% |
900 |
|
Greibrokk, Norway (1994) |
4.9% |
- 85.1%+ |
- |
1843 |
|
Famula et al, USA (1996) |
- 26.0%** |
- |
74.0% |
825 |
|
Wood & Lakhani, UK (1997) |
5.3% |
13.1% |
81.6% |
1234 |
LA = Louisiana;
AZ = Arizona; CA = California
* 151 overlap
with Holliday group
** Not distinguished
+
not BAER tested
Table 3
Association of blue eyes with deafness in Dalmatians
|
Researchers |
Eye colour |
Bilaterally |
Unilaterally deaf |
Normal |
No of dogs |
|
Strain et al |
Brown/Brown |
6.9% |
20.3% |
72.8% |
915 |
|
(1992) |
Brown/Blue |
18.4% |
30.3% |
51.3% |
76 |
|
|
Blue/Blue |
12.5% |
43.8% |
43.8% |
32 |
|
Holliday et al |
Brown/Brown |
5.6% |
18.8% |
75.5% |
799 |
|
(1992) |
Brown/Blue |
15.8% |
39.5% |
44.7% |
76 |
|
|
Blue/Blue |
22.2% |
33.3% |
44.4% |
27 |
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